Can i fixed width of polyline in meter unit?

I want to fixed a size of width in meter unit . When I zoom out , I want width are smaller than zoom in , not equal like in pixel unit. How can i do or i should use Plane ?
image
My polyline is a red one. When i zoom out.


When i zoom in.

Hello,

Maybe a polyline volume would work in your case? You can set a world space shape and size of the line.